One day, I heard my sister and father's voices from my father's room... Although I felt bad about it, I peeked in and saw my father with a camera while my sister was giving him oral sex! I mustered the courage to confront my sister, and she smiled and asked me to peek again tomorrow. The next day, I hesitantly peeked in and saw my sister having sex with my father. As she noticed me watching, she started looking at me lewdly, and I got an erection. Feeling guilty, I stayed in my room, but my sister came in and gave me oral sex, making me erect, then straddled me and inserted herself! She even begged for me to ejaculate inside her!
